EP0235643B1 - Plattenspeicher mit Begrenzung des Antriebes in den Endlagen - Google Patents

Plattenspeicher mit Begrenzung des Antriebes in den Endlagen Download PDF

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Publication number
EP0235643B1
EP0235643B1 EP87102043A EP87102043A EP0235643B1 EP 0235643 B1 EP0235643 B1 EP 0235643B1 EP 87102043 A EP87102043 A EP 87102043A EP 87102043 A EP87102043 A EP 87102043A EP 0235643 B1 EP0235643 B1 EP 0235643B1
Authority
EP
European Patent Office
Prior art keywords
limit stop
spring means
stop control
impact
actuator arm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87102043A
Other languages
English (en)
French (fr)
Other versions
EP0235643A1 (de
Inventor
Edward Walsh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HP Inc
Original Assignee
Hewlett Packard Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of EP0235643A1 publication Critical patent/EP0235643A1/de
Application granted granted Critical
Publication of EP0235643B1 publication Critical patent/EP0235643B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks

Definitions

  • This invention relates to a limit stop control for a disc memory drive according to the first part of claim 1 (US-A-4346 416).
  • Computer disc drives are dynamic information sto­rage units having high bit densities. They are very high precision units requiring close dimensional tolerances in manufacturing and in use and are complex and delicate mechanically. They generally comprise rotatable memory discs, transducer heads and a linear or pivotally mounted, magnetically driven actuator arm assembly which supports the transducer heads and provides bidirectional movement with respect to the discs between inner and outer radial limits.
  • Limit stops are provided to control the limits of movement of the actuator arm assembly.
  • the inner and outer radial limits of travel of the transducer heads with respect to the discs are established.
  • the limits are required for safely restricting the travel in case of drive electronic failure and to establish known locations on the disc to provide information in recovery from a failure.
  • the established radial limits must be precise as to location, precise as to the maintenance of that location, precise as to the maintenance of the stopping distance and must be accomplished in a manner that does not induce vibration or "ringing" of the delicate transducer heads. The ringing is due to the abrupt pickup of the crash stop mass (stationary) by the actuator assembly mass (moving).
  • the actuator arm assemblies are made of light weight material and the moving parts of the magnetic driver coupled to the actuator arm assembly are kept as light as possible, with as much stiffness as possible. This results in as high a natural frequency of vibration as possible.
  • the impact of the actuator arm assembly with the limit stops may have high energy at high frequencies. This makes the actuator arm/transducer assembly vibrate a great deal in spite of the stiffness and frequency. Above a certain level, this vibration can cause damage to the delicate head assemblies, each of which comprises a transducer head mounted to a flexure assembly.
  • the flexure comprises a load finger functioning as a cantilever spring, and a gimble mount for the transducer head.
  • the transducer has two degrees of angular freedom, one in pitch and one in roll in its gimble mount.
  • This invention aims to provide an improvement over the prior art such as discussed above (e.g. US-A-4346 416), in the provision of the characterising features of claim 1, i.e.of an adjustable limit stop arrangement which provides precision in the limit stop setting and nonlinear, frictionally damped, deceleration of the actuator arm assembly in its movement into the limit stop position.
  • the invention is described in its application to a rotary actuator type of disc drive which represents a presently preferred embodiment.
  • the invention is equally applicable to the linear actuator of a linear type of disc drive.
  • Precise limit stop adjustment is achieved in the provision of an eccentric limit stop which is rotatably mounted in a structure which movably supports the actuator arm assembly.
  • Each limit stop has a stiff spring characteristic and is disposed with its eccentric portion in the path of movement of the actuator arm assembly in each of its extremes of movement. Precise adjustments of limit stop positions are provided with this arrangement since the 180 degree rotation of the limit stop member translates into a very small radial displacement at the eccentric portion of the limit stop member. Now a precise limit stop setting is achieved with relative ease.
  • This rotatably mounted eccentric limit stop is easily fabri­cated and machining operations in the actuator housing for its rotatable mounting in a rotary actuator disc drive are all in positions paralleling the pivot axis of the actuator arm assembly, thus jigging for machine operations in cross axes is not required.
  • Stopping in a minimal distance in each limit of movement is achieved in the use of an impact or crash pad having a nonlinear spring characteristic.
  • This pad is mounted on the actuator arm assembly and moves with it to impact the eccentric portion of the limit stop rod.
  • this impact pad utilizes a cantilever spring assembly which has a face portion which impacts the eccentric limit stop.
  • the cantilever spring is a stacked assembly of individual leaf springs of beryllium copper, for example, which are transversely bowed. One end of this stacked assembly is clamped in a clamp on a support struc­ture which is mounted on the actuator arm assembly, or is an integral part of the actuator arm assembly. The stacked, bowed springs project from this clamp.
  • the central area of the free ends of these springs are spaced a small distance from the support structure.
  • the leaf spring assembly impacts the eccentric portion of the limit stop in a posi­tion on the spring assembly displaced from the cantilever spring clamp.
  • the cantilever spring assembly bends and the transverse bow at the unclamped end of the springs begins to flatten out.
  • the actuator arm gives up energy in work done bending the spring, in overcoming friction between leaves of the spring and in initiating acceleration of the eccentric limit stop.
  • the free end of the cantilever spring assembly progressively contacts the support, increasing the spring rate with the flattening of the free end of the cantilever spring against the support.
  • Figures 1 through 16 illustrate the details of a presently preferred embodiment of this invention as a part of a rotary disc memory drive.
  • Figures 1 and 2 are respectively plan and side views of a rotary disc memory drive.
  • Figure 1 is shown fragmentarily in section to better illustrate certain details of this invention.
  • This disc memory drive comprises a disc memory assembly 1 adapted to be driven by a motor (not shown), an actuator structure assembly 3, an arm stack assembly 5 and a magnetic driver assembly 7.
  • the arm stack assembly 5 projects radially outwardly from an axis 30 about which an actuator member 31 rotates or is angularly moveable.
  • Load fingers 52a of the flexure assemblies each have one end attached to an outer extremety of each arm 51 of the arm stack assembly 5 in a position supporting its magnetic head 52 adjacent the surface of a disc 11.
  • the actuator arm assembly is in an angular position about the axis 30, positioning the magnetic heads 52 in their outer radial positions or limits with respect to the magnetic discs.
  • the actuator member 31 is provided with impact pads 31d and 31e which respectively impact eccentric limit stops 31f and 31g which establish the radial limits of angular freedom of the actuator member 31 and, hence, the entire actuator arm assembly.
  • the magnetic driver assembly comprises a permanent magnet structure 71 having permanent magnets 73 and a moving coil assembly 74 which is secured to the actuator member 31 in a position sweeping an arcuate center pole 72 which the moving coil assembly encompasses.
  • Current of reversible polarity in the moving coil 74 produces an electromagnetic field interacting with the permanent magnet field to drive the moving coil one direction or the reverse which moves the actuator assembly angularly between its limits of angular movement.
  • the actuator member 31 is in its counter clockwise position limit, in which position the impact pad 31e abutts the eccentric stop 31g. In this position the transducer heads 52 are at their outer radial limits with respect to the memory discs 11. When the impact pad 31d abutts the eccentric stop 31f which is the clockwise position limit of the actuator member 31, the transducer heads 52 are at their inner radial limits with respect to the memory discs 11. These radial position limits of the transducer heads with respect to the memory discs must be precisely set and must be precisely maintained throughout the operating life. Drift in these position limits, particularly into data areas of the disc, causes malfunctions.
  • Figure 3 is a slightly enlarged view illustrating the actuator arm assembly alone and detailing the installa­tion of the impact pads 31d and 31f on the actuator member 31.
  • Figure 6 will also be useful in visualizing this installation.
  • the actuator member 31 is provided with a mounting bracket section 38 on the side thereon opposite the arm stack 5, having a mounting face which receives the housing of the coil assembly 74 and having innerfaces 38a and 38b, each terminating in beveled outer surfaces for receiving impact pad supports 35, as seen in Figure 3 and in the enlarged longitudal cross sectional view of Figure 5.
  • impact pad supports 35 are each provided with spring pins 35a which are pressed into the impact pad supports and fit snuggly into holes in the bracket section 38 adjacent the beveled surfaces of the bracket, in positions to precisely index the seating surfaces of the impact pad supports against the recieving surfaces of the bracket section 38.
  • the location hole in the support is slightly offset from the corresponding hole in the bracket 38 such that the 45° angled surface on the support is pulled flush with the corresponding surface on the bracket by the spring nature of the pin 35a. This ensures that the only gap formed is the one etween the springs (36) and the supprot (35).
  • the offet between the pin 35a and the hole in which it fits is exaggerated in Figure 5 for the purpose of illustration.
  • screws 35b clearing through holes in flanges 35c on the impact pad supports and holes in the bracket section 38 threadedly engage flanges in the housing of the coil assembly 74, intergrating the impact pads and the coil assembly with the actuator member 31.
  • a cantilever leaf spring assembly 36 comprising a plurality of leaf springs, there being four in number, as shown in Figure 5, is clamped to an elevated surface of the pad support 35 by means of clamp 37.
  • This assembly is secured by means of a blind fastening rivet 37a which securely engages the clamp with the impact pad support.
  • a spring pin 37b pressed into a hole in the clamp 37 passes through clearance holes in the leaf spring assembly 36 and snuggly engages a corresponding hole in the impact pad support 35 to precisely index the clamp 37 and cantilever leaf spring assembly 36 at the time when the rivet 37a is inserted, so that all parts of this impact pad assembly are precisely indexed at the time this blind fastening rivet is set.
  • crash pad assembly is described as a separately fabricated item for ease of manufacturability, it will be apparent that the crash pad may be fabricated by shaping the surfaces 38a and 38b to accept the springs 36 and thereafter securing the springs using the clamp 37 and a fastener such as the blind rivet 37a.
  • FIG. 13 One of the limit stops 31f is illustrated in the elevation and end views of Figures 13 and 14.
  • a stain­less steel rod or pin 39 is insert molded into a jacket 39a of an easily molded plastic or thermoplastic elastomer material.
  • the magnetic permeability of the insert be less than two at 8 kA/m (100 oersteds).
  • This thermoplastic jacket 39a is provided with journals 39b adjacent its ends. The axis of the rod 39 is eccentric with respect to the common axis of these journals.
  • the central body sec­tion 39c as viewed in Figure 13, which is engaged by the impact pads provides a sturdy impact section which affords adjustability of the limits of angular movement of the actuator member.
  • the journals 39b are journaled in upper and lower sections 32b and 32a of the actuator housing 32, as seen in Figure 13, with their common journal axis paralleling the pivot axis 30 of the actuator member 31.
  • This housing is further illustrated in Figures 1 and 2.
  • An enlarged concentric collar 39d of the limit stop rides on the top face of the upper section 32b of this actuator housing 32 and a concentric limit stop 39e provided with edges 39f, formed by differing diameter sections of the limit stop 39e, in cooperation with the clamp 39g ( Figure 15) controls the limits of angular movement of the limit stop 31f.
  • the clamp 39g is screwed to the top face of the upper housing section 32b of the actuator housing 32 in a position fitted about the limit stop 39e, as shown in dotted outline in Figure 14.
  • a tab 39h on the clamp 39g engages the edges 39f to control the limits of angular freedom of the eccentric limit stop. This is designed so that angular freedom amounts to 180 degrees which corresponds to the limits of eccentricity.
  • FIG. 16 An alternative arrangement for controlling the angular freedom and for clamping the eccentric stop in any position between and including its limits of angular freedom is shown in Figure 16.
  • the top section 39c of the eccentric limit stop 31f is slotted as a concentric, semi-­circular slot.
  • a screw which clears through this slot threads into the top face of the upper section 32b of the housing 32 to secure the eccentric stop in selected angular positions.
  • eccentric limit stops 31f and 31g exhibit consistant stiffness under impact. Conceivably such consistant stiffness might be achieved with precise dimensional control of the diameter of the eccentric limit stop journals and the bores in the upper and lower housing sections in which they fit. Such dimensional controls present problems, both in fabrication and in assembly.
  • the clamps 39g provide consistent stiffness boundary conditions at the upper journal ends of the stiff spring rods 39 of the eccentric limit stops. Control of stiffness at the lower end of the rods is achieved by fric­tionally restraining the lower journal of the eccentric limit stop in its housing bore.
  • the bottom section 39k is tapered and a cup 39l having correspondingly, internally tapered side walls slides into the lower journal bore and is axially spring loaded to engage the tapered surfaces. Spring loading is achieved by compressing a spring 39m between the bottom side of the cup 39l and a cup 39n pressed into the open end of the bore.
  • the cup 39l is of a soft, self lubricated material. The spring loaded constraint which it provides wedges the bottom journal of the eccentric limit stop in the bore with sufficient force to limit radial play in the operating range, but with a low enough force to still permit rotational adjustability.

Landscapes

  • Moving Of Heads (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)

Claims (10)

1. Grenzanschlagsteuerung für Plattenspeicherantrieb mit drehbaren Speicherplatten (11), Abtastköpfen (52) zum Abrufen von Informationen aus den Speicher­platten (11), einer beweglich gelagerten Betäti­gungsarmstruktur (3) zum Abstützen und zweisinnigen Bewegen der Abtastköpfe bezüglich der Speicherplat­ten (11) zwischen Grenzstellungen, die durch drehbar im Abstand angebrachte Grenzanschläge (31f,31g) zum Begrenzen der Bewegung der Betäti­gungsarmstruktur (3) bestimmt sind, und nichtlinea­ren Federmitteln (31d,31e) zum Aufbringen einer nichtlinearen Verzögerungskraft auf die Betätigungs­armstruktur (3), dadurch gekennzeich­net, daß jeder Grenzanschlag (31f,31g) einen exzentrischen Anschlagabschnitt (39c) aufweist und daß die nichtlinearen Federmittel (31d,31) an der Betätigungsarmstruktur (3) zum Anschlagen an dem exzentrischen Anschlagabschnitt (39c) der Grenzanschläge (31f,31g) so angeordnet sind, daß die Federrate der Federmittel (31d,31e) mit der Auslenkung der Federmittel erhöht wird.
2. Grenzanschlagsteuerung nach Anspruch l, dadurch gekennzeichnet, daß die nichtlinearen Federmittel (31d,31e) kragarmförmige Federmittel (36) umfassen, welche den exzentrischen Anschlag­abschnitt (39c) des entsprechenden Grenzanschlages (31f,31g) beaufschlagen.
3. Grenzanschlagsteuerung nach Anspruch 2, dadurch gekennzeichnet, daß die nichtlinearen Federmittel (31d,31e) jeweils Mittel (35) auf­ weisen, die eine Stützfläche an der Betätigungsarm­struktur (3) schaffen, wobei die kragarmförmigen Federmittel (36) am einen Ende an der Stützfläche unterstützt sind und ein freies, um einen Ab­stand (G) von der Stützfläche entferntes Ende haben, wobei die Zwischenbereiche der kragarmförmi­gen Federmittel (36) an den entsprechenden Anschlag­abschnitten (39c) der entsprechenden Grenzanschläge (31f,31g) in den entsprechenden Grenzen der Winkelbewegung der Betätigungsarmstruktur (3) anschlagen, wobei die freien Enden der kragarm­förmigen Federmittel (36) auf das Anschlagen ihrer Zwischenabschnitte an einem exzentrischen Anschlagabschnitt (39c) eines Grenzanschlages (31f,31g) sich durchbiegen und an der Stützfläche auflaufen, worauf eine fortgesetzte Bewegung der Betätigungsarmstruktur (3) gegen einen Grenzan­schlag (31f,31g) die kragarmförmigen Federmittel (36) zwischen dem besagten einen Ende und dem freien Ende zurückbiegt.
4. Grenzanschlagsteuerung nach Anspruch 3, dadurch gekennzeichnet, daß die Stützfläche (35) eine Klemme (37) aufweist, welche die einen Enden der kragarmförmigen Federmittel (36) an die Stützfläche anklemmt und die kragarmförmigen Federmittel (36) in Querrichtung biegt.
5. Grenzanschlagsteuerung nach Anspruch 4, dadurch gekennzeichnet, daß die kragarm­förmigen Federmittel (36) mehrere Blattfedern umfassen, welche übereinander in Reibeingriff miteinander angeordnet sind, wobei der Reibein­griff zwischen den Federn eine Reibungsdämpfung beim Biegen der kragarmförmigen Federmittel (36) bereitstellt.
6. Grenzanschlagsteuerung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet daß die Grenzanschläge (31f,31g) je eine Stange (39) umfassen, die an axial im Abstand angeordneten Stellen (39b) drehbar gelagert ist, wobei der exzentrische Anschlagabschnitt (39c) zwischen den axial im Abstand angeordneten Stellen (39b) liegt.
7. Grenzanschlagsteuerung nach Anspruch 6, dadurch gekennzeichnet, daß der exzentrische Anschlagabschnitt (39c) der Stange (39) zwischen den axial im Abstand befindlichen Stellen (39b) eine steife Feder darstellt und sich aufgrund des Anschlagens der nichtlinearen Federmittel (31d,31e) durchbiegt.
8. Grenzanschlagsteuerung nach Anspruch 6, dadurch gekennzeichnet, daß jede Stange (39) jedes Grenzanschlages (31f,31g) einen zum Drehen der Stange zugänglichen Endabschnitt (39e) für die Winkelpositionierung des exzentrischen Anschlagabschnittes (39c) aufweist.
9. Grenzanschlagsteuerung nach Anspruch 8, dadurch gekennzeichnet, daß Reibungsvor­richtungen (39d,39l) nahe den beiden Enden jeder Stange (39) an den Lagern (39b) vorgesehen sind, um eine Drehbewegung der Stange aufgrund von Kräften im Bereich derjenigen Kräfte, welche aufgrund des Auftreffens der kragarmförmigen Federmittel (36) auf den exzentrischen Anschlagab­schnitt (39) ausgeübt werden, zu verhindern.
10. Grenzanschlagsteuerung nach Anspruch 9, dadurch gekennzeichnet, daß die Reibungsvor­richtung (39l) am Fußende jeder Stange (39) einen Napf mit einer konischen Innenfläche aufweist, der in Reibeingriff mit einer konischen Gegenfläche (39k) am Fuß der Stange (39) steht.
EP87102043A 1986-02-14 1987-02-13 Plattenspeicher mit Begrenzung des Antriebes in den Endlagen Expired - Lifetime EP0235643B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US829686 1986-02-14
US06/829,686 US4716482A (en) 1986-02-14 1986-02-14 Head actuator limit stop assembly for a disk memory drive

Publications (2)

Publication Number Publication Date
EP0235643A1 EP0235643A1 (de) 1987-09-09
EP0235643B1 true EP0235643B1 (de) 1991-01-02

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Application Number Title Priority Date Filing Date
EP87102043A Expired - Lifetime EP0235643B1 (de) 1986-02-14 1987-02-13 Plattenspeicher mit Begrenzung des Antriebes in den Endlagen

Country Status (5)

Country Link
US (1) US4716482A (de)
EP (1) EP0235643B1 (de)
JP (1) JPS62189679A (de)
CA (1) CA1284378C (de)
DE (1) DE3766849D1 (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4833667A (en) * 1987-12-17 1989-05-23 Priam Corporation Spindle motor assembly for low acoustic noise environments
JPH0197463U (de) * 1987-12-22 1989-06-28
US4949206A (en) * 1988-07-29 1990-08-14 Miniscribe Corporation Crash stop for rotary disk drive actuator
US4994931A (en) * 1989-11-13 1991-02-19 Hewlett-Packard Company Actuator structure for a magnetic head suspension assembly in a disk drive
US5134608A (en) * 1990-06-01 1992-07-28 Hewlett-Packard Company Disk drive crash stop
US5262913A (en) * 1990-11-09 1993-11-16 Seagate Technology, Inc. Easily adjustable crash stop for a disc drive
US5369538A (en) * 1992-11-12 1994-11-29 Mitsumi Electric Co., Ltd. Rotary disk drive actuator
US5313354A (en) * 1992-11-12 1994-05-17 Seagate Technology, Inc. Disc drive latch housing having improved vibration dampening
US5455726A (en) * 1993-10-07 1995-10-03 Micropolis Corporation Versatile head positioner stop
US5905606A (en) * 1997-07-29 1999-05-18 International Business Machines Corporation High-performance disk drive limit stop employing encapsulated visco-elastic material
US5864449A (en) * 1997-08-22 1999-01-26 International Business Machines Corporation Precision limit stop for high density disk drives
JP2002338751A (ja) * 2001-05-16 2002-11-27 Bridgestone Corp クラッシュストップ
US8320086B1 (en) * 2010-06-28 2012-11-27 Western Digital Technologies, Inc. Disk drive crash stop including a helical portion
TWI480122B (zh) * 2012-07-13 2015-04-11 Univ Nat Kaohsiung Applied Sci 工具機振動載台

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EP0110604A1 (de) * 1982-11-29 1984-06-13 Northern Telecom Limited Vorrichtung und Verfahren zur Positionierung eines Wandlers
EP0129918A2 (de) * 1981-05-29 1985-01-02 Kabushiki Kaisha Toshiba Bandaufzeichnungsgerät

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US4101802A (en) * 1977-03-07 1978-07-18 Rca Corporation Flat display device with beam guide
US4247794A (en) * 1978-03-27 1981-01-27 International Business Machines Corporation Linear actuator
EP0025533A1 (de) * 1979-09-13 1981-03-25 Siemens Aktiengesellschaft Anordnung für beidseitige Hubbegrenzung eines hin- und herbewegten Körpers
US4346416A (en) * 1980-02-29 1982-08-24 Digital Equipment Corporation Rotary actuator assembly for disk drive head positioner

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
EP0129918A2 (de) * 1981-05-29 1985-01-02 Kabushiki Kaisha Toshiba Bandaufzeichnungsgerät
EP0110604A1 (de) * 1982-11-29 1984-06-13 Northern Telecom Limited Vorrichtung und Verfahren zur Positionierung eines Wandlers

Also Published As

Publication number Publication date
EP0235643A1 (de) 1987-09-09
CA1284378C (en) 1991-05-21
US4716482A (en) 1987-12-29
DE3766849D1 (de) 1991-02-07
JPS62189679A (ja) 1987-08-19

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